Spiders usually have silk glands under their abdomen.
蜘蛛通常在腹部下有丝腺。
Spiders do not take well to farming, and as they are mostly teeny little creatures, they don't produce enough silk to be useful in large-scale production.
蜘蛛不适宜大规模养殖，而且由于蜘蛛多为微小的生物，所以它们产出的蛛丝不足以用于大规模生产。
This amazing silk is also used to create lines that spiders hang onto as they travel to new areas.
这种神奇的蛛丝还可以用来制造线绳，使蜘蛛在前往新区域时能紧紧抓住。
Silk production is a key part in a spiders' life.
吐丝是蜘蛛一生中的关键部分。
As some silk researchers see it, if spiders were gregarious vegetarians, the world might be a different place.
在一些丝类研究者看来，如果蜘蛛是一种群居的素食性动物，那世界肯定会变成另一副模样。
'it's the silk that spiders make their webs with.
是蜘蛛直往用的蜘蛛丝。
These transgenic goats, created by Randy Lewis at the University of Wyoming , produce about a half ounce of silk from every quart of milk--the equivalent of a hundred spiders.
怀俄明大学的兰迪·刘易斯创造出的这些转基因山羊产的奶，1夸脱能制成大约0.5盎司丝，这相当于100只蜘蛛产的丝。
Spiders have seven different silk glands that can produce silk with different properties.
蜘蛛有7个不同的丝腺，可以吐出拥有不同特点的蛛丝。
One of the rangers "said the spiders do a Tarzan swing, like they hang down on the silk and swing over, " Agnarsson said.
Agnarsson告诉我们，他说这里的护林员曾说过，达尔文吠蛛可以挂在蜘蛛网上像人猿泰山一样来回游荡。
Golden Orb Weaver Spider Spiders in this group are known for the golden sheen of their silk.
金球织网蜘蛛这类蜘蛛以发光的金丝得名。
Black widows are comb-footed spiders, which means they have bristles on their hind legs that they use to cover their prey with silk once it has been trapped.
黑寡妇长着梳子状的脚，这就意味着它们用后腿上的刚毛盖住被网丝捕获的猎物。
A new study reveals that dragline silk, the stuff spiders use to rappel, has a molecular structure that makes it resilient to twisting.
悬在丝上的蜘蛛身体为什么不容易晃动？法国研究人员发现，原来蜘蛛丝中含有一种特殊的分子结构，能使蛛丝富有弹性，很容易克服摆动。
As a result, researchers have looked at alternative ways of producing silk without spiders, by duplicating their spinning technique.
因此，研究人员通过对蜘蛛吐丝本领进行复制，思索了别的方法不用到蜘蛛来生产丝。
Male nursery web spiders lure mates with silk-wrapped offerings, only some of which contain tasty treats. Cynthia Graber reports.
雄性保育蛛用丝裹的物品引诱雌性，只有部分这类物品里面有美味的食物。辛西娅·格雷伯报导。
Rind also studied tarantula feet under an electron microscope and found tiny silk-producing spigots intermingled with the hairs on the spiders' feet.
Rind在电子显微镜下观察狼蛛的足部，发现了混杂在足部绒毛中的微小的产丝构造。
And, Mortimer explains, in a way, spiders can move their silk threads, much like a musician plays the strings of a guitar.
莫蒂默也解释说，在某种程度上，蜘蛛可以移动它们的丝线，就像是音乐家拨动吉它的弦一样。
So do webs made by spiders. The lines of silk they produce can carry vibrations. This movement gives the small creature information about what landed on the web.
蜘蛛织的网也是如此，它们吐出的蜘蛛丝可以传播振动。振动能给这种小生物提供信息，让它们知道蛛网上落了什么东西。
Spider silk has long fascinated scientists but producing it in commercial quantities is difficult because spiders kept in captivity tend to eat each other.
蜘蛛丝很早就让科学家们惊奇不已，可是要按照商业数目去生产是一件困难的事情，因为关在一起的蜘蛛会互食。
That's because spiders enhance the uniformity of their silk as they pull it from their spinnerets.
这是因为蜘蛛在从吐丝器官里拉出蛛丝的同时也加强了其韧性。
Silk is also used for the safety lines many spiders drag behind them, which save them if they fall.
蛛丝也是许多蜘蛛拖在身后的安全索，能在它们跌落时保住小命。
At least three spiders produce dragline silk that, if spun into thicker strands, could be as strong as the nylon and carbon fibers used in high-performance aircraft.
至少有三种蜘蛛能产生牵引丝；假如把这些丝结得更粗，它们就会像用于高性能飞机上的尼龙和碳纤维那样牢固。
What interests scientists about web-weaving spiders is the silk strands of the webs.
科学家们对织网型蜘蛛的兴趣在于构成蛛网的丝线。
The discovery supports a hypothesis that ancient spiders first evolved to produce silk from their feet before changing to the modern configuration of producing it in their abdomens.
这个发现提供了一个假说，蜘蛛的祖先可能是用脚吐丝，只是到了现代才改为由腹部吐丝的。
Researchers genetically engineered goats to produce milk which is packed with the same protein as silk spiders.
研究人员通过遗传工程创造的山羊可以产下一种特殊的羊奶。这种羊奶所含蛋白质与蜘蛛丝的蛋白质相同。
The spiders use the silk to spin webs.
蜘蛛用丝编成环行网。
Can it be possible that the spiders can fly?Otherwise, how could the first silk have been drawn from one eave to the other with the width of more than ten feet?
难道蜘蛛会飞?要不，从这个檐头到那个檐头，中间有一丈余宽，第一根线是怎么拉过去的？
Can it be possible that the spiders can fly?Otherwise, how could the first silk have been drawn from one eave to the other with the width of more than ten feet?
难道蜘蛛会飞?要不，从这个檐头到那个檐头，中间有一丈余宽，第一根线是怎么拉过去的？
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